Most homework is just something like "read for 30 minutes". Other than that, they do sometimes assign more formal homework, but most of it takes 5-10 minutes, and they explicitly state that if it you spend 30 minutes on it and haven't finished, you can stop.
Every week the kids pick 4 books from a set of books the teacher chose for that individual's reading level. And they get to go to the library and pick any book they want.
And no homework over the weekend, except to "have fun".